code: def testZero(self):
      input = [0] * 1024
      expected = [0] * 513
  
      result = PowerSpectrum(size=len(input))(input)
  
      self.assertEqualVector(result, expected)
  
file_path: essentia/test/src/unittests/standard/test_powerspectrum.py
imports: from essentia_test import *
label_desc: Use image node_id 7 for calling the TestPowerSpectrum obj's underlying member method code with example usage: obj.testZero() without return types